The NsertAseal Access Hole seal is designed to seal large (22" to 34") access
holes (manholes). Our seals are fitted into place with caulk and gaskets.
Access hole lids are replaced after installation. These seals stop the migration
of sewer gas to the atmosphere. If required for the application, they can be
fitted with a water seal to allow entry of wastewater to the process sewer
system while preventing sewer gas from escaping into the atmosphere.
